Page 121 - Formulas and Calculations for Petroleum Engineering

114 Formulas and calculations for petroleum engineering

2.90 Gas migration velocity

Input(s)
Dp cs : Pressure (psi)
g m : Depth (ft)
Dt: Time over which the Rise in Casing Pressure Occurs (h)

Output(s)

v sl : Gas Migration Velocity (ft/h)

Formula(s)

v ¼ Dp =g Dt
sl
m
cs
Reference: Watson, D., Brittenham, T., & Moore, P. L. (2003). Advanced Well Control (Vol. 10). Society of Petroleum
Engineers, Page: 12.

2.91 Gas solubility in a mud system

Input(s)
f o : Volume Fraction of Base Oil (fraction)
f w : Volume Fraction of Water (fraction)
f e : Volume Fraction of Emulsifier (fraction)
r so : Solution Gas/Component Ratio of Base Oil (fraction)
r sw : Solution Gas/Component Ratio of Water (fraction)
r se : Solution Gas/Component Ratio of Emulsifier (fraction)

Output(s)

r sm : Solution Gas/Component of the Mud (fraction)

Formula(s)

r ¼ f r + f r + f r
sm o so w sw e se

Reference: Watson, D., Brittenham, T., & Moore, P. L. (2003). Advanced Well Control (Vol. 10). Society of Petroleum
Engineers, Page: 16.

2.92 Gas/mud ratio

Input(s)
d b : Bit Diameter (in.)
R: Penetration Rate (ft/h)
S g : Gas Saturation (fraction)
Ø: Formation Porosity (per cent)
p: Pressure (psi)
z: Gas Compressibility Factor (dimensionless)
t: time (h)
q m : Mud Circulation Rate (bbl/min)